constellation: Only return focused browsing contexts that exist. #51848
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Signed-off-by: Josh Matthews <josh@joshmatthews.net>
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⛔ The downstream PR has merged (servo/servo#36330), but these changes could not be merged properly. Please address any CI issues and try to merge manually. |
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The webdriver server relies on the constellation to report which browsing context is focused, and assumes that a focused context is ready for interaction. However, new browsing contexts exist in a weird state where they are not tracked by the constellation until the initial load is complete, which leads to the constellation rejecting attempts to navigate a browsing context right after it's created. These changes ensure the constellation does not report a browsing context as focused until it's actually created and ready for interaction.
Testing: Run
./mach test-wpt --product servodriver tests/wpt/mozilla/tests/mozilla/DOMParser.html, which now runs to completion.Fixes: #34551
Fixes: #36328
Reviewed in servo/servo#36330